Wrote introduction and conclusion

21-alerts-and-popovers/21-alerts-and-popovers.md

@@ -9,4 +9,49 @@ but have a read through the rest of this post first!
 
 ## Introduction
 
-## Conclusion
+Presenting new views and view controllers to users on iOS has evolved a lot
+since the original iPhoneOS. This has resulted in a pretty inconsistent state in
+iOS7 - with some presentation methods being device restrictive, and others
+creating views in second UIWindow objects.
+
+iOS8 introduces the concept of a presentation controller, in the form of 
+`UIPresentationController`. This is used to control the process of presenting
+new view controllers in every scenario. This means that the way you use alerts,
+popovers and action sheets has changed, to make a much more coherent and self-
+consistent system.
+
+This post won't go into depth on presentation controllers (that may well appear
+in a later article), but instead focuses on what you need to know to update your
+apps to the new iOS8 way of presenting popovers, alerts and action sheets.
+
+The sample app which accompanies this project is available on github at
+[github.com/ShinobiControls/iOS8-day-by-day](https://github.com/ShinobiControls/iOS8-day-by-day).
+
+## Pop Overs
+
+
+## Alerts
+
+
+## ActionSheets
+
+
+## Conclusion
+
+It's great when Apple take a look back at existing parts of the framework and
+consolidate the way in which it works. This section of UIKit had evolved over
+many years, and was in need of modernization. The quest for adaptivity and
+becoming device agnostic has made it an ideal time to rethink the way they work.
+It's an area that you should make sure you are aware of - it's a lot more
+understandable than it used to be.
+
+As ever, all the code for today's article is available on the ShinobiControls
+github at
+[github.com/ShinobiControls/iOS8-day-by-day](https://github.com/ShinobiControls/iOS8-day-by-day).
+Let me know what you think on twitter 
+[@iwantmyrealname](https://twitter.com/iwantmyrealname).
+
+
+sam
+
+